Abstract
A mass spectrometric study of the positive ions in the positive column of dc glow discharges in pure CO2 and CO2 gas laser mixtures has been undertaken to determine the nature of the ions and to elucidate the ion kinetics. Results are presented over the ranges 2–20 torr, 3–15 mA cm−2 and for reaction times of 0.1–1.0 s. The nature of the dominant ion species is dependent on the minority neutral species produced in the discharge. O2 + is the major species in pure CO2, but NO+ accounts for ≳70% of the positive ions in a 6% CO2–12% N2–82% He laser mixture and ions of the H3O+. (H2O)n type (n=0, 1, 2) become important in CO2–N2–He–H2 laser mixtures. A semiquantiative reaction kinetic model is developed to explain the formation of these ions and to aid predictive modelling of other CO2 laser systems.
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